BlackBerry suggests that those losing WhatsApp check out the cross-platform BBM
BlackBerry says that it isn't giving up. The company has told Tech Radar that its support for BlackBerry 10 is "unwavering." The company added that "We are actively exploring alternatives for BlackBerry users once support of WhatsApp Messenger for BBOS and BlackBerry 10 ends in late 2016."
BlackBerry sent out a couple of tweets last week. One passed along the message that BlackBerry is working on other options to WhatsApp. The second tweet pointed out that the Android powered BlackBerry Priv will still support WhatsApp, even beyond this year. BlackBerry does recommend that those losing WhatsApp support turn to its own cross-platform BBM.
If you are in danger of losing WhatsApp at the end of 2016, use the rest of the year to find a replacement that offers all of the features that you've come to know and love on the Facebook owned messaging app. And yes, you could start with BBM.
source: BlackBerry (1), (2) via TechRadar